Title :
A synchronous reference frame based control of an unified power flow controller
Author :
Vilathgamuwa, Mahinda ; Shing, Choi San ; Jet, Tseng King ; Xin, Zhu
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
The unified power flow controller (UPFC) device, which has the capability of controlling real power flow and reactive power flows at sending end and receiving end of a transmission line, was originally proposed by L. Gyugi (see IEE Proceedings, vol.139, no.4, p.323-31, 1992). According to this scheme, an AC voltage vector generated by a GTO-based inverter is injected in series with the phase voltage in the transmission line. In this paper a robust H∞ controller is used to control line currents in both the shunt and series inverters of the UPFC. The line current controller is designed to ensure robust performance and internal stability of the UPFC against disturbances and unstructured parameter variations. Conventional PI control system performance is compared with the H∞ control to highlight their contrasting features
Keywords :
H∞ control; electric current control; invertors; load flow; load regulation; power system control; power transmission lines; reactive power control; robust control; thyristor convertors; AC voltage vector injection; GTO-based inverter; internal stability; line current controller; line currents control; phase voltage; reactive power flow control; real power flow control; receiving end; robust H∞ controller; sending end; series inverters; shunt inverters; synchronous reference frame based control; transmission line; unified power flow controller; unstructured parameter variations; AC generators; Inverters; Load flow; Pi control; Power transmission lines; Reactive power control; Robust control; Robust stability; System performance; Voltage;
Conference_Titel :
Power Electronics and Drive Systems, 1997. Proceedings., 1997 International Conference on
Print_ISBN :
0-7803-3773-5
DOI :
10.1109/PEDS.1997.627505
